how do I constantly change the direction of a ray with a loop and my mouse?

Code:

local ray = Ray.new(char.HumanoidRootPart.CFrame.p, mouse.p)


while true do
    wait()
    trident.CFrame = char.HumanoidRootPart.CFrame*CFrame.new(0,2.5,0)
    trident.CFrame = CFrame.new(trident.CFrame.p  ,  ray.Direction)*CFrame.Angles(0,math.rad(180),0)
end

I tried to make this trident constantly point where my mouse was pointing before I launch it. The problem here is that when I fire the command, it would only constantly point at the last thing I pointed at, not where my mouse is currently. How do I fix this?